Locking mechanism for doors



May 8, 1945.

L. o. cEDERwALL LOCKING MECHANISM FOR IOQRS Filed June 26, 1943 2 sheets-Sheet 1 Lu f l May 89 w45. L' o. CDERWALL. 2,375,196

LOCKING MECHANISM -FOR DOORS Filed June 2e, 1943 2 sheets-sheet 2 LOCKING MECHANISM FOR DOORS Leonard 0. Cederwall, New Orleans, La., assignor to Consolidated` Vultee Aircraft Corporation, San Diego, Calif., a corporation of Delaware Application June 26,1943, serial No. 492,390

l i The invention relates to locking mechanism for doors.

In aircraft it is desirable and advantageous to provide shifting mechanism for the door-,locking bolts which includes a lever on the outboard side of the door, and an inboard handle or lever whereby the bolts may be shifted from either the inside and outside of the door, and also to provide locking mechanism for the shifting mechanism which is key controlled from the outside and selectivelycontrolled from the inside of the door so that the shifting mechanism may be unlocked from `theinside of the-door without the use of a key.

One object of the invention is to -provide im'- proved locking means for the bolt-shifting mechanism which is key-controlled from the outside of the door.

A still further object of the invention is to pro- A vide making mechanism for the bolt-shifting mechanism which is key-controlled from the outside and selectively controlled from the inside of the door, which is simple in construction and efdcient in operation.

Another object of the invention is to provide shifting mechanism for the locking bolts which comprises a slidable and rotatable shaft, handlevers rigidly secured on the inner and outer ends Y of the' shaft, and fa recess for the outsidelever,

and whereby the shifting mechanism maybe operated, and locking mechanism for the shifting mechanisimwhich is particularly adapted for use with doors in aircraft. e

Other objects will appear from the detailed description.

The invention consists in the several novel fea- Vdoor, embodying the invention. g,

Fig. 2 'is an outer side elevation of a portion of the door. l

Fig. 3 is a section taken on line 3-3 of Fig. 5.-

Fig. 4 is a section taken on line 4.-5 of Fig. 5.

ing. 5 1s the inside of the' doer. and the locking" mechanism for the doorL shifting mechanism,

parts-being shownin sectio Fig. 6 is a view of the device for locking the shifting mechanism when it is in its held unlocked position by the selectively -siiiftable lever on the inner side of the door, and the key-operable lock is locked, parts being shown in section.

55 lof the door;

5 withdrawn from the cylinder-lock.

Fig 8 is a similar view of said device, with the parts in the position assumed when the key-controlled lockhas shifted the selectively shiftable lever to unlock the shifting mechanism and be- 10 fore the key is withdrawn.

Fig. 9 is a perspective of the slidable plunger.

The invention is exemplied asapplied to an aircraft door a which is usually formed of sheet metal with an inner wall a', and an outer wall c which may be of any suitable construction.`

Bolts b are provided withouter ends which are adaptedito be projected into holes. in the door frame to lock the door in its closed position and are movable inwardly to release the door so it can be opened. One series of bolts b is provided for the lower portion of the door and a similar series is provided for the upper portion of the door. Adjacent its outer end, each bolt b is slidably and pivotally guided by a spherical Lmember b1 which is confined in a. socket b2. The inner end of each pf the lower series of bolts bis pivotally connected to a rotatable member or spider c-which is pivotally supported on theldoor a.

The inner ends of vthe bolts b of the upper series are pivotally connected to a rotatable element or spider d which is controlled by the locking mechanism hereinafter described. A connecting rod c3 is eccentrically pivoted to elements d and c and operates and controls the spider c from the spider d. Rotation of the spider d in clockwise direction willl directly withdraw-the' upper series of bolts b and throughrod c3 will simultaneously withdraw the bolts' Ab of the lower series. fWhen 40 the bolts b havebeen withdrawn, rotationof the spider din counterclockwise direction will simuh taneously shift all of the bolts to lock thedoor. This exemplies boltv shifting mechanism for v locking the door which, is operable by rotation of the spider d.

`The spider d is provided with a'hub d1 which isjournaled in a plate or housing e whichis set into an opening in the outer wall a? ofthe door and hasits margin lapped by and secured to said 5o wall. A square shaft "f entends through and is Afitted to spider d and its hub dlfor rotation ntherewithl and is slidable axially therethrough., A lever g is xedly secured to the inner end of f shaft f for rotating the spider 'd from the'inside A lever h is xedly 'secured to the outer end of shaft f for rotating the spider from the outside of the door. A recess ex is formed in the plate or housing e and conforms substantially to the marginal contour of the lever h so that the outer face of said lever `will be normally iiush with the outer face of the door. The lever h. normally abuts against a washer h1 which engages the wall at the bottom of the'recess el to position said lever so its outer face will be flush with the outer face of the door. A spring i is interposed between spider d and lever g on the inner end of t'ne shaft f and yieldingly and normally holds the lever h within the recess ei in the housing e, the shaft f to its inner position, and thehub d1 of spider d in its bearing in the easing e. When the door is to be opened from the outside, the lever h can be pulled out of recess el so vit will be disposed outwardly of the outer face of the door where it will be free for rotation. A rub-plate e* for lever h is provided on the door. The t between shaft f and the hub dl of spider d causes the spider d to be rotated by either the lever'h or handle g. The spring i permits the withdrawal of the lever h from recess e1 and normally retracts the shaft f when either of the levers h and g is released. The sliding ilt between shaft f and spider d also permits the shaft to be pushed outwardly to shift lever h out of recess e1 by outward pressure against the lever g or pull on lever-h so thatshaft f can he rotated to rotate the .spider d. This exemplifies a construction which includes a lever which is normally flush with the outside of thedoor, for shifting the bolts b'from the outside of the door and a lever for shifting the bolts h from the inside of the door and a, connection between the levers whereby the outsidev lever can be pushed out of the recess inthe casing e by the inside lever g to permit the rotation of the spider d.

The invention includes mechanism for locking the spider d against rotation by the levers h and g andthis locking mechanism is adapted to be controlled from the outside of the door by a key-operable cylinder-lock k and an element l which functions as a lever and is selectively operable from the inside of the door. Spider d is notched to form an abutment l0 and is provided with an arcuate peripheral surface II. plunger AI2 is slidable into the path of abutment Il to lock the spider d against rotation in counterclockwise direction for holding the bolts b in their locking position. Plunger I2 is slidably mounted in a guideway I2 formed in a casing eL5 which is integrally formed with the casing or plate e and projects inwardly from said housing. A cover-plate Il secured to the inner face of easing els connes the plunger I2 forvrectilinear movement in the guide I I. Lever l is provided with-cam-surfaces' Il and Il which engage abutmnts Il and 20, respectively, on'the plunger I2 and fit in a recess between said abutments. Stops 2I`and-22 on' casing es limit the pivotal movement of lever l. When the lever l engages stop 2| the cam-surfaces on said lever will hold the plunger I2. in its locking position 'for engagement by 'abutment Il on the spider d to prevent cointerclockwise rotation of shaft f and levers -g and h.

'When the lever l engages stop 22 cam-surfaces I1 4'and Il will hold the'plunger I2 out otthe path of abutment Il so that the spider d will be rotatitlileby4 eithe'rof the'levers a, k. Thearcuate peripheral surface I I prevents shift of theplunger llwhenthegpiderdisnotinpositiontohold '.thebltlbintheiriookitllpiticn. i'eilient or spring strip 23 frictionally holds the plunger I2 against sliding movement. A resilient or spring strip 24 secured to lug 25 on the casing e*s engages the cam-surfaces on lever l. The cam-surfaces I1 and`l8 meet at a point 26 and spring 2l acts on the cams at opposite sides of said l.point and serves to snap the lever l to alternately engage one or the other of the stops 2l and 22. The plunger I2 is shiftable between its locked and unlocked position by the lever l which is selectively operable from the inside of the door and is also operable by the key-controlled lock k. This lock k is of any suitable construction which comprises a cylinder, a barrel k1 which is rotatable in the cylinder, and provided with a key-slot k3 and a notch k2 in the cylinder which permits the insertion and withdrawal of the key at one predetermined rotative position. The barrel is rotatable by the key in either direction from said` fixedly secured to rotate with the barrel k1 of thelock lc. At all times when the key is withdrawn from the barrel the lever I6 will be in the position shown in Fig. 6.

An eccentric st ud 28 is fixed to and projects from lever l into the path of rotation of the arms I5, lh of the lever I5. By means of lever I5 and stud 28, lever l may be shifted or controlled by a key in the cylinder-lock. When the lever I5 is in position to hold the plunger I2 into position to lock the spider d and a key is inserted into the .lock Ic, counterclockwise movement of the key will rotate lever I5 and cause its arm I5*s to strike stud 28 and shift, lever l into position. to shift the plunger I2 so it will release the spider d, as illustrated in Fig. 6. Whenl the lever l is in position to hold the plunger ,i2 in its releasing position,

and the key is inserted in the cylinder-lock and rotated in clockwise direction, the arm lib of lever cylinder-lock. This permits the spider d to be unlocked from the inside of the doorl without the use cfa key and permits the lever l to be operated from the outside of the door by the cylinder-lock to shift the plunger I2 to release or to lock the spider d. After either operation of the lever` l by the cylinder-lock the lever IB'will be shifted to its normal position by theturning ofthe key to its withdrawal and insertion position.

The operation will be as'follows: When there is no key in the cylinder lock It; the lever I5 will be in the position illustrated in Fis. 6 as the result of the rotation of the barrel of the cylinder-lock by the key to the point where the notch Ita permits the withdrawal ot the key. Lever l can be selectively shifted from the inner side of-the door between stops 2| and zz tri-smit the plunger Iz into position to lock or releasev the spider d. This can be done independently fof the cylinder-lock at all times when the key is withdrawn from the lock k. While the plunger I2 is in its released position. the spider d will be free to be rotated by the lever-V handle h from the outer side of the door or by the handle g from the inner side of the door. When it is desired to lock or unlock the door fromits outer sid thekeyis insertedinto cylinder lockk. VIfat su time the lever lhasshifted the plunger I2 to -claim'- as' new and desire lease the spider d. When the spider d has been shifted either from the inner side of the door or by the. cylinder-lock to shift the plunger I2 into its released position, and it is desired to lock the door from the outer side, the key will be inserted in the cylinder-lock and rotated clockwise to shift the levers l5 and l into the position illustrated in f Fig. '7. This clockwise rotation of lever I5 with the barrel of the cylinder-lock will cause arm I5b to strike stud 28 and shift the lever I to shift the plunger I2 into its locking position.

The invention exemplifies locking mechanism which is particularly applicable to doors'foraircraft,'which is simple in construction and which provides for selective control of the locking device for the shifting mechanism from the inside of the vdoor and for key controlled operation of said device from the outer side ofthe door. It also exemplifies a construction in which an outer handle lever is normally confined in a recess, and a handle at the inner side of the door are fixed to a shaft which is slidable from the inner' or outer side of the door and which is rotatable to operate the bolt shifting mechanism.

The invention is not understood to be restricted to the details set forth, since these may be modied within the scope of the appended claims without departing from the spirit and scope of the invention.

Having thus described the invention, what I to secure by Letters Patent is:

1. The `combination with a casing on a door, a rotatable element mounted on. the casing for shifting locking means for the door and provided with an abutment, a shaft mountedin the casing for rotating said element, and` handles on the shaft on the inner side and the outside of the door, respectively, of a plunger mounted to slide on the inner side of the casing, into and out of relation with saidabutment, a manually shiftable lever pivoted on the inner side of the casing and provided with oppositely disposed circumferential cam faces for slidably shifting the Aplunger between and holding it yin its .locking and releasing positions, a key-controlled cylinder lock accessible from the outside of the door, a second lever pivotally shiftable by the cylinder lock for shifting the :rst lever from plunger releasing to plunger locking position and from plunger locking to plunger releasing position, said first named lever being shiftable to set the plungerv into either its locking or releasing position when thefcylinder lock is locked.

2. The combination with a. casing on a door, a rotatable yelement mounted on the casing for shifting locking means forl the door and provided with a vradial abutment and an arcuate surface leading from theabutment, a shaft mounted in thecasing for rotating, said element, handles on the shaft on the` inner side and the outside of the door, respectively, of a plunger mounted to slide radiallyof the shaft, on the inner side of the casing into and out of relation.

with said abutmentand into abutting relation with said arcuate surface, al manually' shift.-v

able lever -pivoted .on the inner side of the casingand provided with oppositely disposed circumferential c am faces for slidably shiftingthe plunger between, and holding it in its locking and releasing positions, a key-controlled cylinder lock accessible from the outside of the door,

a, second lever pivotally shiftable and controlled by the cylinder lock,y and means engageable by the second lever for shifting the iirst leverl from plunger releasing to plunger locking position and from' plunger locking to plunger releasing position, said first namedlever being shiftble vto set the plunger into either its locking or releasing position when the cylinder lock is locked.

3. 'I'he combination with a casing on a door, a

yrotatable element mounted on the casing for shifting locking means for the door and provided with an abutment, a shaft mounted in the casing for rotating s'aid element, handles on tl'ne shaft on the 4inner side and the outside of thev door, respectively, of a plunger mounted to slid on 4the inner side of the casing into and'out of relation with said'abutment, a manually shift'- L able lever pivoted on the inner side of the casing and provided with oppositely disposed c'irlever pivoted concentrically with and shiftable cumferential cam faces forshifting the plunger between and'holding it in its locking and releasing positions, a key-controlled cylinder vlock accessible from the outside of the door a second and controlled by the cylinder lock, and a stud on the rst named lever shiftable by the second lever for shifting said first vlever from plunger releasing to plunger locking position and from plunger locking to plunger releasing position,

said first named lever being shiftable independ- A ently of the second lever to set the plunger into either its locking or releasing position when the cylinder lock is locked;

4. 'Ihe combination with a casing on a door,

a rotatable element mounted on the casing for shifting locking means for the door and provided with an abutment and an arcuate surface, a shaft mounted in the casing for rotating said element, handles on the shaft on the, inner side and the outside of the door, respectively, of a .plungermounted to slide on the. inner side of the casing intoy and out of relation with said 'abutment and intoabutting relation with said arcuate surface,l a manuallyshiftable lever pivloted on the inner side of the casing and provided with oppositely disposed circumferential cam d@ and controlled by the -cylinder lock provided with v radial arms, and means engageable by the :i

. of the second lever for `shifting the rst leve from plunger releasing to plunger locking posi- I tion and from plunger lockingto plunger releasing position, aid first Vnamed lever being shiftable indepen ently of the second lever to set the plunger into either its locking or releasing position when the cylinder lock is locked.

5. The combination with a, casing on a door, a

yrotatable element mounted on the "casing for shifting locking means for the door and providedwith an abutment and an arcuate surface,- a shaft mounted in the casing for rotating said element, handles on the shaft on the inner side and the outside of the door, respectively, of a plungermounted to slide on the inner side of the casing into and out of relationv with saidabutment and into abutting relation with said-arcuatei surface, 'a manually shiftable lever pivoted on theinner side of the casing. and provided with oppositeiy disposed circumferential cam laces for shifting the plunger between and holding .it in its locking and releasing positions, a. key-controlled cyiinder'lock `accessible from the ou'i'side of the door. a second lever pivoted coneentricaliy with the cylinder lock. and shiitable and controlled by the cylinder lock provided with radial arms, and means engageable by the arins of the second lever for shifting the first lever from plunger releasing to plunger locking posi- LEONARD O. CEDERWALL. 

